I'm very sorry for your loss, but you did the right thing by not letting her suffer. It's one of the hardest things to do, Megan yelped one time when they gave her the relaxing shot, and my Vet told it was ok for her to have the last word, just like any Yorkie does. It's still hard almost a year later, but I always try and remember the good times.
Wishing you the best. Quad & Gina
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RIP Megan 3/1998-5/28/2013